/* ═══════════════════════════════════════════════════════════════════════════
   Learn GHDXP — Main Stylesheet
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── 1. CSS Variables ─────────────────────────────────────────────────────── */
:root {
  --color-primary:       #0057B7;
  --color-primary-dark:  #004494;
  --color-primary-light: #e8f0fb;
  --color-accent:        #FFD700;
  --color-accent-dark:   #c9a800;

  --color-bg:            #F5F7FA;
  --color-surface:       #FFFFFF;
  --color-surface-2:     #F0F4F8;
  --color-border:        #E2E8F0;

  --color-text:          #1E293B;
  --color-text-muted:    #64748B;
  --color-text-light:    #94A3B8;

  --color-success:       #16A34A;
  --color-danger:        #DC2626;
  --color-warning:       #D97706;

  --sidebar-width:       280px;
  --header-height:       64px;
  --container-max:       1200px;
  --radius-sm:           6px;
  --radius:              12px;
  --radius-lg:           20px;
  --radius-full:         9999px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
  --shadow:     0 4px 12px rgba(0,0,0,.10);
  --shadow-md:  0 8px 24px rgba(0,0,0,.12);
  --shadow-lg:  0 16px 40px rgba(0,0,0,.16);

  --transition: .2s ease;
  --font-head:  'Montserrat', sans-serif;
  --font-body:  'Inter', sans-serif;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --color-bg:         #0F172A;
  --color-surface:    #1E293B;
  --color-surface-2:  #243347;
  --color-border:     #334155;
  --color-text:       #F1F5F9;
  --color-text-muted: #94A3B8;
  --color-text-light: #64748B;
  --color-primary-light: #1a2f4a;
}

/* ── 2. Reset & Base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── 3. Container & Layout ────────────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 20px;
}

.site { display: flex; flex-direction: column; min-height: 100vh; }
.site-content-wrapper { flex: 1; }

/* Content layout: sidebar LEFT + main RIGHT */
.content-layout {
  display: flex;
  gap: 32px;
  padding-block: 32px;
  align-items: flex-start;
}

.site-main { flex: 1; min-width: 0; }

/* ── 4. Buttons ───────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,87,183,.3);
}

.btn--accent {
  background: var(--color-accent);
  color: #1a1a1a;
  border-color: var(--color-accent);
}
.btn--accent:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #1a1a1a;
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn--danger  { background: var(--color-danger);  color: #fff; border-color: var(--color-danger); }
.btn--success { background: var(--color-success); color: #fff; border-color: var(--color-success); }
.btn--danger:hover  { background: #b91c1c; color: #fff; }
.btn--success:hover { background: #15803d; color: #fff; }

.btn--sm  { padding: 7px 14px; font-size: .8rem; }
.btn--full { width: 100%; justify-content: center; }

.btn--hero {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
  font-size: 1rem;
  padding: 12px 28px;
}
.btn--hero:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #1a1a1a;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,.2);
}

/* ── 5. Site Header ───────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: var(--shadow);
  transition: background var(--transition);
}

.site-header.is-scrolled { box-shadow: var(--shadow-md); }

.header-inner {
  display: flex;
  align-items: center;
  height: var(--header-height);
  gap: 20px;
}

/* Brand */
.header-brand { flex-shrink: 0; }
.header-site-name {
  font-family: var(--font-head);
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -.5px;
}
.header-site-name:hover { color: var(--color-accent); }
.header-logo img { height: 40px; width: auto; }

/* Nav */
.header-nav { flex: 1; }

.nav-menu {
  display: flex;
  gap: 4px;
  align-items: center;
}

.nav-menu li a {
  color: rgba(255,255,255,.85);
  font-size: .9rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  transition: all var(--transition);
}
.nav-menu li a:hover,
.nav-menu li.current-menu-item a {
  color: #fff;
  background: rgba(255,255,255,.15);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,.1);
  border: none;
  color: #fff;
  cursor: pointer;
  transition: all var(--transition);
}
.header-btn:hover { background: rgba(255,255,255,.25); }

/* Dark/Light icon toggle */
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun  { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* Lang badge */
.header-lang-badge {
  font-size: 1.3rem;
  cursor: default;
  padding: 4px;
}

/* Mobile menu toggle */
.header-btn--menu { display: none; flex-direction: column; gap: 4px; }
.burger-line {
  display: block;
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}

/* Inline Search Bar */
.header-search-bar {
  background: var(--color-primary-dark);
  padding: 12px 0;
  border-top: 1px solid rgba(255,255,255,.1);
}
.header-search-bar form { display: flex; gap: 8px; }
.header-search-input {
  flex: 1;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: none;
  font-family: var(--font-body);
  font-size: .9rem;
  background: rgba(255,255,255,.15);
  color: #fff;
  outline: none;
}
.header-search-input::placeholder { color: rgba(255,255,255,.6); }
.header-search-input:focus { background: rgba(255,255,255,.25); }
.header-search-submit {
  padding: 8px 16px;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-full);
  color: #1a1a1a;
  cursor: pointer;
  transition: background var(--transition);
}
.header-search-submit:hover { background: var(--color-accent-dark); }

/* ── 6. Hero Section ──────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #003d8a 60%, #002561 100%);
  color: #fff;
  padding: 80px 0 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  padding-bottom: 60px;
}

.hero-heading {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -.5px;
}

.hero-subheading {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  opacity: .85;
  margin-bottom: 36px;
}

/* Language Picker */
.language-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 36px;
}

.lang-pick-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 24px;
  min-width: 110px;
  background: rgba(255,255,255,.12);
  border: 2px solid rgba(255,255,255,.25);
  border-radius: var(--radius);
  color: #fff;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(6px);
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
}

.lang-pick-btn:hover {
  background: rgba(255,255,255,.25);
  border-color: rgba(255,255,255,.6);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,.2);
}

.lang-pick-btn.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #1a1a1a;
  box-shadow: 0 6px 20px rgba(255,215,0,.4);
}

.lang-pick-flag {
  font-size: 2.2rem;
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,.2));
}

.lang-pick-name {
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .2px;
}

/* Hero Wave */
.hero-wave {
  position: relative;
  bottom: -2px;
  line-height: 0;
}
.hero-wave svg { width: 100%; display: block; }

/* ── 7. Section Headers ───────────────────────────────────────────────────── */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}
.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}
.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
}

.categories-section { padding-block: 60px; }

/* ── 8. Category Grid ─────────────────────────────────────────────────────── */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 20px 24px;
  background: var(--color-surface);
  border-radius: var(--radius);
  border-top: 4px solid var(--cat-color, var(--color-primary));
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: var(--color-text);
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--cat-color, var(--color-primary));
  opacity: 0;
  transition: opacity var(--transition);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}
.category-card:hover::before { opacity: .05; }

.category-card__icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
  line-height: 1;
  position: relative;
}

/* Language card — flag style */
.category-card--language {
  padding-top: 24px;
}

.category-card__flag {
  font-size: 3.2rem;
  line-height: 1;
  margin-bottom: 12px;
  position: relative;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,.2));
  transition: transform var(--transition);
}
.category-card--language:hover .category-card__flag {
  transform: scale(1.12);
}

.category-card__name {
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 6px;
  position: relative;
}

.category-card__count {
  font-size: .8rem;
  color: var(--color-text-muted);
  position: relative;
}

.category-card__arrow {
  position: absolute;
  bottom: 12px;
  right: 16px;
  color: var(--cat-color, var(--color-primary));
  font-size: 1rem;
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--transition);
}
.category-card:hover .category-card__arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ── 9. Breadcrumbs ───────────────────────────────────────────────────────── */
.breadcrumbs {
  margin-bottom: 20px;
}
.breadcrumbs__list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.breadcrumbs__item {
  font-size: .85rem;
  color: var(--color-text-muted);
}
.breadcrumbs__item::after {
  content: '/';
  margin-left: 8px;
  color: var(--color-border);
}
.breadcrumbs__item:last-child::after { display: none; }
.breadcrumbs__item a { color: var(--color-primary); }
.breadcrumbs__item a:hover { text-decoration: underline; }
.breadcrumbs__item--active { color: var(--color-text); font-weight: 500; }

/* ── 10. Page Header ──────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--color-surface);
  border-radius: var(--radius);
  border-left: 5px solid var(--cat-color, var(--color-primary));
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.page-header__icon { font-size: 2.5rem; line-height: 1; flex-shrink: 0; }

.page-header__title {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.page-header__desc { color: var(--color-text-muted); font-size: .9rem; }

.page-title {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 24px;
}

/* ── 11. Lessons List (category + index) ──────────────────────────────────── */
.lessons-list { display: flex; flex-direction: column; gap: 16px; }

.lesson-card {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition);
  position: relative;
}

.lesson-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.lesson-card__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  min-height: 100%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .9rem;
  flex-shrink: 0;
}

.lesson-card__thumb {
  display: block;
  width: 120px;
  flex-shrink: 0;
  overflow: hidden;
}
.lesson-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lesson-card__body {
  flex: 1;
  padding: 16px 20px;
}

.lesson-card__title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.lesson-card__title a { color: var(--color-text); }
.lesson-card__title a:hover { color: var(--color-primary); }

.lesson-card__excerpt {
  font-size: .88rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 8px;
}

.lesson-card__meta { display: flex; gap: 16px; align-items: center; }
.meta-date { display: flex; align-items: center; gap: 4px; font-size: .8rem; color: var(--color-text-light); }

.lesson-card__btn {
  display: flex;
  align-items: center;
  align-self: center;
  white-space: nowrap;
  margin-right: 16px;
  flex-shrink: 0;
}

.lesson-date { font-size: .8rem; color: var(--color-text-light); }

/* ── 12. Pagination ───────────────────────────────────────────────────────── */
.pagination-wrap { margin-top: 32px; }
.pagination-wrap .nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.pagination-wrap .page-numbers {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.pagination-wrap .page-numbers:hover,
.pagination-wrap .page-numbers.current {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ── 13. Single Lesson ────────────────────────────────────────────────────── */
.lesson-single {}

.lesson-header {
  padding: 28px;
  background: var(--color-surface);
  border-radius: var(--radius);
  border-left: 5px solid var(--cat-color, var(--color-primary));
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.lesson-header__category {
  display: inline-block;
  font-size: .85rem;
  color: var(--color-primary);
  margin-bottom: 12px;
  font-weight: 500;
}
.lesson-header__category:hover { text-decoration: underline; }

.lesson-header__title {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

.lesson-header__meta { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }

.lesson-lang-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: .85rem;
  font-weight: 600;
}

.lesson-content {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.lesson-body { line-height: 1.75; }
.lesson-body p { margin-bottom: 1rem; }
.lesson-body h2, .lesson-body h3 {
  font-family: var(--font-head);
  font-weight: 700;
  margin: 1.5rem 0 .75rem;
}

/* ── 14. Vocabulary Table ─────────────────────────────────────────────────── */
.vocab-section,
.phrases-section { margin-top: 32px; }

.vocab-section__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.vocab-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.vocab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}

.vocab-table thead th {
  padding: 12px 16px;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: .85rem;
  text-align: left;
  white-space: nowrap;
}
.vocab-table thead th:first-child { border-radius: var(--radius-sm) 0 0 0; }
.vocab-table thead th:last-child  { border-radius: 0 var(--radius-sm) 0 0; }

.vocab-row { transition: background var(--transition); }
.vocab-row:nth-child(even) { background: var(--color-surface-2); }
.vocab-row:hover           { background: var(--color-primary-light); }

.vocab-table td { padding: 12px 16px; border-bottom: 1px solid var(--color-border); vertical-align: middle; }
.vocab-table tbody tr:last-child td { border-bottom: none; }

.vocab-word {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vocab-transcr { color: var(--color-text-muted); font-style: italic; }
.vocab-translation { font-weight: 500; }

/* Speech Button */
.speech-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 2px;
  opacity: .7;
  transition: all var(--transition);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.speech-btn:hover { opacity: 1; transform: scale(1.2); }
.speech-btn.is-speaking { animation: pulse .6s infinite; }

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.3); }
}

.vocab-actions { margin-top: 16px; }

/* ── 15. Lesson Navigation ────────────────────────────────────────────────── */
.lesson-nav {
  display: flex;
  gap: 16px;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.lesson-nav__prev,
.lesson-nav__next { flex: 1; }
.lesson-nav__next { text-align: right; }

.lesson-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: .9rem;
  transition: all var(--transition);
}
.lesson-nav__link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.lesson-nav__link span { display: flex; flex-direction: column; }
.lesson-nav__link small { font-size: .75rem; color: var(--color-text-muted); margin-bottom: 2px; }
.lesson-nav__link:hover small { color: rgba(255,255,255,.7); }
.lesson-nav__link--next { flex-direction: row-reverse; }

/* ── 16. Flashcard Modal ──────────────────────────────────────────────────── */
.flashcard-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.flashcard-modal[hidden] { display: none; }

.flashcard-modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  cursor: pointer;
}

.flashcard-modal__box {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.flashcard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.flashcard-progress { font-size: .9rem; color: var(--color-text-muted); font-weight: 600; }
.flashcard-close {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.flashcard-close:hover { background: var(--color-surface-2); color: var(--color-text); }

.flashcard-card {
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform .3s;
  transform-style: preserve-3d;
  position: relative;
}

.flashcard-card:hover { transform: scale(1.01); }
.flashcard-card.is-flipped { transform: rotateY(180deg); }

.flashcard-front,
.flashcard-back {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  text-align: center;
  padding: 20px;
  backface-visibility: hidden;
}

.flashcard-back {
  transform: rotateY(180deg);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-success);
  border-radius: var(--radius);
}

.flashcard-hint { text-align: center; font-size: .85rem; color: var(--color-text-muted); }

.flashcard-actions {
  display: flex;
  gap: 12px;
}
.flashcard-actions .btn { flex: 1; justify-content: center; }

/* ── 17. Sidebar ──────────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
  max-height: calc(100vh - var(--header-height) - 40px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 2px; }

.sidebar-widget {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.sidebar-widget__title {
  font-family: var(--font-head);
  font-size: .85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
}

/* Sidebar Search */
.search-input-wrap { position: relative; display: flex; }
.sidebar-search-input {
  width: 100%;
  padding: 9px 40px 9px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: .88rem;
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition);
}
.sidebar-search-input:focus { border-color: var(--color-primary); }
.sidebar-search-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-full);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.sidebar-search-btn:hover { background: var(--color-primary-dark); }

/* Sidebar Languages */
.sidebar-langs-list { display: flex; flex-direction: column; gap: 4px; }
.sidebar-lang-item { }
.sidebar-lang-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: .88rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}
.sidebar-lang-btn:hover { border-color: var(--color-primary); background: var(--color-primary-light); }
.sidebar-lang-item.is-active .sidebar-lang-btn {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
}
.lang-flag  { font-size: 1.2rem; }
.lang-name  { flex: 1; font-weight: 500; }
.lang-check { margin-left: auto; font-size: .9rem; }

/* Sidebar Categories */
.sidebar-categories-list { display: flex; flex-direction: column; gap: 2px; }
.sidebar-cat-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  color: var(--color-text);
  transition: all var(--transition);
  border-left: 3px solid transparent;
}
.sidebar-cat-link:hover {
  background: var(--color-surface-2);
  border-left-color: var(--cat-color, var(--color-primary));
  color: var(--color-text);
}
.cat-icon  { font-size: 1rem; }
.cat-name  { flex: 1; }
.cat-count {
  font-size: .75rem;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  padding: 2px 7px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* Stats Widget */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.stat-item {
  text-align: center;
  padding: 12px 8px;
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
}
.stat-number {
  display: block;
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-primary);
}
.stat-label { font-size: .72rem; color: var(--color-text-muted); font-weight: 500; }

/* Recent List */
.recent-list { display: flex; flex-direction: column; gap: 12px; }
.recent-item { display: flex; gap: 10px; align-items: flex-start; }
.recent-thumb { width: 50px; height: 50px; border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0; }
.recent-thumb img { width: 100%; height: 100%; object-fit: cover; }
.recent-info { flex: 1; }
.recent-title {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  margin-bottom: 3px;
}
.recent-title:hover { color: var(--color-primary); }
.recent-date { font-size: .75rem; color: var(--color-text-light); }

/* Category Sidebar Specifics */
.cat-info-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  padding: 12px;
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--cat-color, var(--color-primary));
}
.cat-info-icon { font-size: 2rem; }
.cat-info-name { font-family: var(--font-head); font-weight: 700; font-size: 1rem; }
.cat-info-count { font-size: .8rem; color: var(--color-text-muted); }
.cat-info-desc { font-size: .85rem; color: var(--color-text-muted); line-height: 1.5; }

.sidebar-subcats-list { display: flex; flex-direction: column; gap: 2px; }
.sidebar-subcat-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  color: var(--color-text);
  border-left: 3px solid var(--cat-color, var(--color-primary));
  transition: background var(--transition);
}
.sidebar-subcat-link:hover { background: var(--color-surface-2); }
.subcat-count {
  margin-left: auto;
  font-size: .75rem;
  color: var(--color-text-muted);
}

.cat-lessons-list { display: flex; flex-direction: column; gap: 2px; margin-bottom: 12px; }
.cat-lesson-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  color: var(--color-text);
  transition: all var(--transition);
}
.cat-lesson-link:hover { background: var(--color-surface-2); color: var(--color-primary); }
.cat-lesson-item.is-current .cat-lesson-link {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

.parent-cat-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .88rem;
  color: var(--color-primary);
  font-weight: 500;
}
.parent-cat-link:hover { text-decoration: underline; }

/* ── 18. Footer ───────────────────────────────────────────────────────────── */
.site-footer {
  background: #0F172A;
  color: #CBD5E1;
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-block: 56px;
}

.footer-site-name {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.footer-logo img { height: 36px; filter: brightness(0) invert(1); margin-bottom: 12px; }

.footer-about-text {
  font-size: .88rem;
  line-height: 1.7;
  color: #94A3B8;
  margin-bottom: 20px;
}

.footer-social { display: flex; gap: 10px; }
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,.08);
  border-radius: var(--radius-full);
  color: #94A3B8;
  transition: all var(--transition);
}
.social-link:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.footer-col__title {
  font-family: var(--font-head);
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #fff;
  margin-bottom: 16px;
}

.footer-nav-list { display: flex; flex-direction: column; gap: 8px; }
.footer-nav-list li a {
  font-size: .88rem;
  color: #94A3B8;
  transition: color var(--transition);
}
.footer-nav-list li a:hover { color: var(--color-accent); }

.footer-langs-list { display: flex; flex-direction: column; gap: 6px; }
.footer-lang-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-sm);
  color: #94A3B8;
  font-size: .85rem;
  font-family: var(--font-body);
  padding: 6px 10px;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  width: 100%;
}
.footer-lang-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 16px 0;
  text-align: center;
}
.footer-bottom p { font-size: .82rem; color: #475569; }

/* ── Language-Specific Footer ─────────────────────────────────────────────── */

/* Top accent banner */
.footer-lang-banner {
  background: linear-gradient(
    90deg,
    var(--footer-lang-color, var(--color-primary)) 0%,
    #0F172A 100%
  );
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.footer-lang-banner__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 0;
}

.footer-lang-banner__left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-lang-banner__flag {
  font-size: 2.4rem;
  line-height: 1;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,.3));
}

.footer-lang-banner__name {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2px;
}

.footer-lang-banner__hint {
  font-size: .8rem;
  color: rgba(255,255,255,.6);
}

.footer-lang-banner__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: var(--radius-full);
  color: #fff;
  font-size: .85rem;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.footer-lang-banner__btn:hover {
  background: var(--footer-lang-color, var(--color-primary));
  border-color: var(--footer-lang-color, var(--color-primary));
  color: #fff;
  transform: translateX(3px);
}

/* Subcategory Quick Nav Row */
.footer-subcats-nav {
  background: #1a2535;
  border-bottom: 1px solid rgba(255,255,255,.06);
  padding: 14px 0;
}

.footer-subcats-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.footer-subcat-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-full);
  color: #94A3B8;
  font-size: .82rem;
  font-weight: 500;
  transition: all var(--transition);
  text-decoration: none;
}

.footer-subcat-link:hover {
  background: rgba(255,255,255,.12);
  color: #fff;
  border-color: rgba(255,255,255,.25);
}

.footer-subcat-item.is-active .footer-subcat-link {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.footer-subcat-icon { font-size: 1rem; line-height: 1; }
.footer-subcat-name { font-size: .82rem; }
.footer-subcat-count {
  background: rgba(255,255,255,.15);
  border-radius: var(--radius-full);
  padding: 1px 7px;
  font-size: .72rem;
  font-weight: 600;
}
.footer-subcat-item.is-active .footer-subcat-count {
  background: rgba(255,255,255,.25);
}

/* Lang Footer columns */
.footer-inner--lang {
  grid-template-columns: 1.4fr 1fr 1fr;
}

.footer-lang-info-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 1.6rem;
}

.footer-lang-stats {
  display: flex;
  gap: 20px;
  margin-top: 16px;
}

.footer-lang-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.footer-lang-stat span {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.footer-lang-stat small {
  font-size: .72rem;
  color: #64748B;
  text-transform: uppercase;
  letter-spacing: .8px;
  margin-top: 3px;
}

/* Bottom bar with breadcrumb nav */
.footer-bottom__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.footer-bottom-nav a {
  font-size: .8rem;
  color: #475569;
  transition: color var(--transition);
}
.footer-bottom-nav a:hover { color: var(--color-accent); }
.footer-bottom-nav span { color: #334155; font-size: .8rem; }

/* Responsive */
@media (max-width: 768px) {
  .footer-lang-banner__btn  { display: none; }
  .footer-inner--lang       { grid-template-columns: 1fr; }
  .footer-lang-stats        { justify-content: flex-start; gap: 24px; }
  .footer-bottom__inner     { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .footer-subcats-list { gap: 6px; }
  .footer-subcat-name  { display: none; }
  .footer-subcat-icon  { font-size: 1.2rem; }
  .footer-subcat-link  { padding: 8px 10px; }
}

/* ── 19. Page Article (page.php) ──────────────────────────────────────────── */
.page-article {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}
.page-content { line-height: 1.75; }
.page-content p  { margin-bottom: 1rem; }
.page-content h2 { font-family: var(--font-head); font-size: 1.4rem; font-weight: 700; margin: 1.5rem 0 .75rem; }
.page-content h3 { font-family: var(--font-head); font-size: 1.15rem; font-weight: 600; margin: 1.25rem 0 .5rem; }

/* ── 20. 404 Page ─────────────────────────────────────────────────────────── */
.error-404 {
  text-align: center;
  padding: 64px 20px;
}
.error-404__code {
  font-family: var(--font-head);
  font-size: 8rem;
  font-weight: 800;
  color: var(--color-primary);
  opacity: .15;
  line-height: 1;
  margin-bottom: -20px;
}
.error-404__title { font-family: var(--font-head); font-size: 2rem; font-weight: 700; margin-bottom: 12px; }
.error-404__text  { color: var(--color-text-muted); margin-bottom: 28px; }

/* ── 21. No Results ───────────────────────────────────────────────────────── */
.no-results, .no-content {
  padding: 40px 20px;
  text-align: center;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border-radius: var(--radius);
}

/* ── 22. Misc ─────────────────────────────────────────────────────────────── */
.page-header.category-page-header { margin-bottom: 24px; }

/* ── 23. Responsive — Tablet (≤1024px) ───────────────────────────────────── */
@media (max-width: 1024px) {
  :root { --sidebar-width: 240px; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-col--langs { grid-column: 1 / -1; }
}

/* ── 24. Responsive — Mobile (≤768px) ────────────────────────────────────── */
@media (max-width: 768px) {
  :root { --sidebar-width: 100%; }

  /* Header */
  .header-nav { display: none; }
  .header-nav.is-open {
    display: block;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-primary-dark);
    z-index: 99;
    padding: 12px 0;
    box-shadow: var(--shadow-md);
  }
  .header-nav.is-open .nav-menu { flex-direction: column; gap: 0; padding: 0 16px; }
  .header-nav.is-open .nav-menu li a { display: block; padding: 12px 16px; border-radius: var(--radius-sm); }

  .header-btn--menu { display: flex; }
  .site-header { position: relative; }

  /* Layout */
  .content-layout {
    flex-direction: column;
    padding-block: 20px;
  }

  .sidebar {
    width: 100%;
    position: static;
    max-height: none;
    overflow: visible;
  }

  /* Hero */
  .hero { padding: 48px 0 0; }
  .language-picker { gap: 10px; }
  .lang-pick-btn { padding: 12px 16px; min-width: 85px; }
  .lang-pick-flag { font-size: 1.8rem; }

  /* Category grid */
  .category-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }

  /* Lesson card */
  .lesson-card { flex-wrap: wrap; }
  .lesson-card__thumb { width: 100%; height: 160px; }
  .lesson-card__thumb img { width: 100%; height: 100%; }
  .lesson-card__btn { margin: 0 16px 16px; width: calc(100% - 32px); justify-content: center; }
  .lesson-card__number { width: 100%; height: 36px; }

  /* Vocab table */
  .vocab-table { font-size: .82rem; }
  .vocab-table td, .vocab-table th { padding: 9px 10px; }

  /* Footer */
  .footer-inner { grid-template-columns: 1fr; gap: 28px; padding-block: 40px; }

  /* Flashcard */
  .flashcard-modal__box { padding: 20px; }

  /* Lesson nav */
  .lesson-nav { flex-direction: column; gap: 10px; }
  .lesson-nav__next { text-align: left; }
  .lesson-nav__link--next { flex-direction: row; }

  /* Stats */
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 480px) {
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-heading  { font-size: 1.7rem; }
  .lang-pick-btn { padding: 10px 12px; min-width: 75px; }
  .lang-pick-flag { font-size: 1.6rem; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   Language Category Page — New Design
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Lang Hero ───────────────────────────────────────────────────────────── */
.lang-hero {
  position: relative;
  background: linear-gradient(
    135deg,
    var(--lang-color, var(--color-primary)) 0%,
    #001a3a 100%
  );
  color: #fff;
  padding-top: 32px;
  overflow: hidden;
}

.lang-hero__bg-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 50%, rgba(255,255,255,.08) 0%, transparent 60%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,.06) 0%, transparent 50%);
  pointer-events: none;
}

.lang-hero__breadcrumbs .breadcrumbs__item,
.lang-hero__breadcrumbs .breadcrumbs__item::after,
.lang-hero__breadcrumbs .breadcrumbs__item a {
  color: rgba(255,255,255,.7);
}
.lang-hero__breadcrumbs .breadcrumbs__item--active { color: rgba(255,255,255,.95); }
.lang-hero__breadcrumbs .breadcrumbs__item a:hover { color: #fff; }

.lang-hero__content {
  display: flex;
  align-items: center;
  gap: 28px;
  padding-top: 28px;
  padding-bottom: 12px;
  position: relative;
  z-index: 1;
}

.lang-hero__flag {
  font-size: 5.5rem;
  line-height: 1;
  flex-shrink: 0;
  filter: drop-shadow(0 6px 16px rgba(0,0,0,.3));
  animation: flagFloat 3s ease-in-out infinite;
}

@keyframes flagFloat {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-6px); }
}

.lang-hero__title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 10px;
  letter-spacing: -.5px;
  text-shadow: 0 2px 8px rgba(0,0,0,.2);
}

.lang-hero__subtitle {
  font-size: 1.05rem;
  opacity: .85;
  max-width: 480px;
}

/* Stats Bar */
.lang-hero__stats {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(0,0,0,.2);
  backdrop-filter: blur(10px);
  border-radius: var(--radius) var(--radius) 0 0;
  margin-top: 32px;
  padding: 20px 32px;
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255,255,255,.1);
}

.lang-stat {
  flex: 1;
  text-align: center;
}

.lang-stat__num {
  display: block;
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 4px;
}

.lang-stat__label {
  font-size: .8rem;
  opacity: .7;
  text-transform: uppercase;
  letter-spacing: .8px;
  font-weight: 600;
}

.lang-stat__divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,.2);
  flex-shrink: 0;
}

/* Wave Transition */
.lang-hero__wave {
  line-height: 0;
  margin-top: -1px;
}
.lang-hero__wave svg {
  width: 100%;
  display: block;
  height: 60px;
}

/* ── Sections Area ──────────────────────────────────────────────────────── */
.lang-sections {
  padding-block: 48px 64px;
}

.lang-sections__header {
  text-align: center;
  margin-bottom: 36px;
}

.lang-sections__title {
  font-family: var(--font-head);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.lang-sections__subtitle {
  color: var(--color-text-muted);
  font-size: .95rem;
}

/* ── Subcategory Grid ───────────────────────────────────────────────────── */
.lang-subcats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.lang-subcat-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  text-decoration: none;
  color: var(--color-text);
  transition: all .22s ease;
  border-bottom: 3px solid var(--sc-color, var(--color-primary));
  position: relative;
}

.lang-subcat-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--sc-color, var(--color-primary));
  opacity: 0;
  transition: opacity .22s ease;
  pointer-events: none;
}

.lang-subcat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}
.lang-subcat-card:hover::after { opacity: .04; }

.lang-subcat-card__icon-wrap {
  background: rgba(0,0,0,.04);
  padding: 24px 24px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.lang-subcat-card__icon {
  font-size: 2.8rem;
  line-height: 1;
  transition: transform .22s ease;
}
.lang-subcat-card:hover .lang-subcat-card__icon {
  transform: scale(1.15) rotate(-4deg);
}

.lang-subcat-card__body {
  padding: 16px 20px 12px;
  flex: 1;
  position: relative;
  z-index: 1;
}

.lang-subcat-card__name {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.lang-subcat-card__desc {
  font-size: .82rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.lang-subcat-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px 16px;
  border-top: 1px solid var(--color-border);
  position: relative;
  z-index: 1;
}

.lang-subcat-card__count {
  font-size: .82rem;
  font-weight: 600;
  color: var(--sc-color, var(--color-primary));
}

.lang-subcat-card__arrow {
  color: var(--sc-color, var(--color-primary));
  opacity: 0;
  transform: translateX(-6px);
  transition: all .22s ease;
  display: flex;
  align-items: center;
}
.lang-subcat-card:hover .lang-subcat-card__arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .lang-hero__content { flex-direction: column; text-align: center; gap: 16px; }
  .lang-hero__flag    { font-size: 4rem; animation: none; }
  .lang-hero__title   { font-size: 2rem; }
  .lang-hero__stats   { padding: 16px; gap: 0; }
  .lang-stat__num     { font-size: 1.4rem; }
  .lang-subcats-grid  { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }
  .lang-sections      { padding-block: 32px 48px; }
}

@media (max-width: 480px) {
  .lang-subcats-grid { grid-template-columns: 1fr 1fr; }
  .lang-hero__stats  { padding: 14px 12px; }
  .lang-stat__num    { font-size: 1.2rem; }
  .lang-subcat-card__icon { font-size: 2.2rem; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   Subcategory Page — New Design
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Sub-Hero ───────────────────────────────────────────────────────────── */
.subcat-hero {
  position: relative;
  background: linear-gradient(
    135deg,
    var(--sc-color, var(--color-primary)) 0%,
    #0F172A 100%
  );
  color: #fff;
  padding-top: 28px;
  overflow: hidden;
}

.subcat-hero__bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 85% 30%, rgba(255,255,255,.07) 0%, transparent 55%),
    radial-gradient(circle at 10% 70%, rgba(255,255,255,.05) 0%, transparent 45%);
  pointer-events: none;
}

.subcat-hero__breadcrumbs .breadcrumbs__item,
.subcat-hero__breadcrumbs .breadcrumbs__item::after,
.subcat-hero__breadcrumbs .breadcrumbs__item a { color: rgba(255,255,255,.65); }
.subcat-hero__breadcrumbs .breadcrumbs__item--active { color: rgba(255,255,255,.95); }
.subcat-hero__breadcrumbs .breadcrumbs__item a:hover { color: #fff; }

.subcat-hero__content {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 0 16px;
  position: relative;
  z-index: 1;
}

.subcat-hero__icon-wrap {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  background: rgba(255,255,255,.12);
  backdrop-filter: blur(8px);
  border: 2px solid rgba(255,255,255,.2);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.subcat-hero__icon {
  font-size: 2.6rem;
  line-height: 1;
}

.subcat-hero__parent-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .82rem;
  font-weight: 600;
  color: rgba(255,255,255,.7);
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  margin-bottom: 10px;
  transition: all var(--transition);
  text-decoration: none;
}
.subcat-hero__parent-link:hover {
  color: #fff;
  background: rgba(255,255,255,.18);
}

.subcat-hero__title {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 8px;
  text-shadow: 0 2px 8px rgba(0,0,0,.2);
}

.subcat-hero__desc {
  font-size: .95rem;
  opacity: .8;
  max-width: 480px;
  margin-bottom: 12px;
}

.subcat-hero__meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.subcat-hero__count {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  font-weight: 600;
  color: rgba(255,255,255,.8);
  background: rgba(255,255,255,.12);
  border-radius: var(--radius-full);
  padding: 5px 14px;
}

.subcat-hero__wave {
  line-height: 0;
  margin-top: 16px;
}
.subcat-hero__wave svg { width: 100%; display: block; height: 40px; }

/* ── Siblings Tabs ──────────────────────────────────────────────────────── */
.subcat-siblings-nav {
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  position: sticky;
  top: var(--header-height);
  z-index: 90;
  box-shadow: var(--shadow-sm);
}

.subcat-tabs {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.subcat-tabs::-webkit-scrollbar { display: none; }

.subcat-tab__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 14px 18px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  margin-bottom: -2px;
}

.subcat-tab__link:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.subcat-tab.is-active .subcat-tab__link {
  color: var(--sc-color, var(--color-primary));
  border-bottom-color: var(--sc-color, var(--color-primary));
}

.subcat-tab__count {
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  padding: 1px 7px;
  font-size: .75rem;
  font-weight: 700;
  color: var(--color-text-muted);
}
.subcat-tab.is-active .subcat-tab__count {
  background: var(--sc-color, var(--color-primary));
  color: #fff;
}

/* ── Main Content ───────────────────────────────────────────────────────── */
.subcat-content {
  padding-block: 40px 64px;
}

.subcat-main { max-width: 100%; }

/* ── Lesson Cards Grid ──────────────────────────────────────────────────── */
.subcat-lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.subcat-lesson-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all .22s ease;
}
.subcat-lesson-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* Thumbnail */
.subcat-lesson-card__thumb {
  display: block;
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--color-surface-2);
}
.subcat-lesson-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.subcat-lesson-card:hover .subcat-lesson-card__thumb img {
  transform: scale(1.05);
}

.subcat-lesson-card__thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity .22s ease;
}
.subcat-lesson-card:hover .subcat-lesson-card__thumb-overlay { opacity: 1; }

.subcat-lesson-card__play {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sc-color, var(--color-primary));
  transform: scale(.85);
  transition: transform .22s ease;
}
.subcat-lesson-card:hover .subcat-lesson-card__play { transform: scale(1); }

/* Placeholder (no thumbnail) */
.subcat-lesson-card__thumb--placeholder {
  aspect-ratio: 16/9;
  background: linear-gradient(
    135deg,
    var(--sc-color, var(--color-primary)) 0%,
    #0F172A 100%
  );
  display: flex;
  align-items: center;
  justify-content: center;
}
.subcat-lesson-card__num {
  font-family: var(--font-head);
  font-size: 3rem;
  font-weight: 800;
  color: rgba(255,255,255,.2);
}

/* Body */
.subcat-lesson-card__body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 10px;
}

.subcat-lesson-card__badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--sc-color, var(--color-primary));
}

.subcat-lesson-card__title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0;
}
.subcat-lesson-card__title a {
  color: var(--color-text);
  text-decoration: none;
}
.subcat-lesson-card__title a:hover { color: var(--sc-color, var(--color-primary)); }

.subcat-lesson-card__excerpt {
  font-size: .85rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  flex: 1;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.subcat-lesson-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.subcat-lesson-card__date {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .78rem;
  color: var(--color-text-muted);
}

.subcat-lesson-card__btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 16px;
  background: var(--sc-color, var(--color-primary));
  color: #fff;
  font-size: .82rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all .22s ease;
}
.subcat-lesson-card__btn:hover {
  opacity: .88;
  color: #fff;
  transform: translateX(2px);
}

/* Empty State */
.subcat-empty {
  text-align: center;
  padding: 80px 20px;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.subcat-empty__icon { font-size: 4rem; display: block; margin-bottom: 20px; opacity: .4; }
.subcat-empty h2 { font-family: var(--font-head); font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; }
.subcat-empty p  { color: var(--color-text-muted); margin-bottom: 24px; }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .subcat-lessons-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .subcat-hero__content   { flex-direction: column; text-align: center; gap: 16px; }
  .subcat-hero__parent-link { align-self: center; }
  .subcat-hero__icon-wrap { width: 64px; height: 64px; }
  .subcat-hero__icon      { font-size: 2rem; }
  .subcat-lessons-grid    { grid-template-columns: 1fr; }
  .subcat-tab__link       { padding: 12px 12px; font-size: .78rem; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   Single Lesson Page — New Design
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Lesson Hero ──────────────────────────────────────────────────────────── */
.lesson-hero {
  position: relative;
  background: linear-gradient(135deg, var(--lesson-color, var(--color-primary)) 0%, #0F172A 100%);
  color: #fff;
  padding-top: 28px;
  overflow: hidden;
}
.lesson-hero__bg {
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 80% 25%, rgba(255,255,255,.07) 0%, transparent 55%),
    radial-gradient(circle at 15% 75%, rgba(255,255,255,.05) 0%, transparent 45%);
  pointer-events: none;
}
.lesson-hero__breadcrumbs .breadcrumbs__item,
.lesson-hero__breadcrumbs .breadcrumbs__item::after,
.lesson-hero__breadcrumbs .breadcrumbs__item a { color: rgba(255,255,255,.65); }
.lesson-hero__breadcrumbs .breadcrumbs__item--active { color: rgba(255,255,255,.9); }
.lesson-hero__breadcrumbs .breadcrumbs__item a:hover { color: #fff; }
.lesson-hero__content {
  display: flex; align-items: center; gap: 24px;
  padding: 24px 0 16px; position: relative; z-index: 1;
}
.lesson-hero__icon-wrap {
  width: 72px; height: 72px; flex-shrink: 0;
  background: rgba(255,255,255,.12); backdrop-filter: blur(8px);
  border: 2px solid rgba(255,255,255,.2); border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 2.4rem; line-height: 1;
}
.lesson-hero__back {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .8rem; font-weight: 600; color: rgba(255,255,255,.7);
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius-full); padding: 4px 12px; margin-bottom: 10px;
  transition: all var(--transition); text-decoration: none;
}
.lesson-hero__back:hover { color: #fff; background: rgba(255,255,255,.18); }
.lesson-hero__title {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  font-weight: 800; line-height: 1.15; margin-bottom: 12px;
  text-shadow: 0 2px 8px rgba(0,0,0,.2);
}
.lesson-hero__meta {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.lesson-hero__lang {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px; background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius-full);
  font-size: .82rem; font-weight: 600; color: #fff;
}
.lesson-hero__date {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .8rem; color: rgba(255,255,255,.65);
}
.lesson-hero__wave { line-height: 0; margin-top: 16px; }
.lesson-hero__wave svg { width: 100%; display: block; height: 40px; }

/* ── Layout ───────────────────────────────────────────────────────────────── */
.lesson-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  padding-block: 36px 64px;
  align-items: start;
}
.lesson-main  { min-width: 0; }

/* ── Article ──────────────────────────────────────────────────────────────── */
.lesson-article {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 24px;
}
.lesson-featured-img img {
  width: 100%; height: auto; display: block;
  max-height: 420px; object-fit: cover;
}

/* Body content typography */
.lesson-body {
  padding: 32px;
  line-height: 1.8;
  font-size: .97rem;
  color: var(--color-text);
}
.lesson-body h2 { font-family: var(--font-head); font-size: 1.3rem; font-weight: 700; margin: 1.6rem 0 .8rem; color: var(--color-text); }
.lesson-body h3 { font-family: var(--font-head); font-size: 1.1rem; font-weight: 600; margin: 1.3rem 0 .6rem; }
.lesson-body p  { margin-bottom: 1rem; }
.lesson-body ul, .lesson-body ol { padding-left: 1.4em; margin-bottom: 1rem; }
.lesson-body li { margin-bottom: .3rem; }
.lesson-body strong { font-weight: 700; color: var(--color-text); }
.lesson-body table { width: 100%; border-collapse: collapse; margin-bottom: 1.4rem; font-size: .9rem; }
.lesson-body table th {
  background: var(--color-surface-2); padding: 10px 14px;
  text-align: left; font-weight: 700; border-bottom: 2px solid var(--color-border);
}
.lesson-body table td { padding: 9px 14px; border-bottom: 1px solid var(--color-border); }
.lesson-body table tr:hover td { background: var(--color-surface-2); }

/* Speakable words in body */
.lesson-body .speakable {
  cursor: pointer;
  border-bottom: 2px dotted var(--lesson-color, var(--color-primary));
  color: var(--lesson-color, var(--color-primary));
  font-weight: 600;
  transition: opacity var(--transition);
}
.lesson-body .speakable:hover { opacity: .75; }

/* ── Vocab / Phrases Section ─────────────────────────────────────────────── */
.lesson-vocab-section {
  border-top: 1px solid var(--color-border);
  padding: 28px 32px;
}
.lesson-section-header {
  display: flex; align-items: center; gap: 10px; margin-bottom: 20px;
}
.lesson-section-icon { font-size: 1.5rem; line-height: 1; }
.lesson-section-title {
  font-family: var(--font-head); font-size: 1.1rem; font-weight: 700;
  color: var(--color-text); flex: 1; margin: 0;
}
.lesson-section-count {
  font-size: .78rem; font-weight: 700; padding: 3px 10px;
  background: var(--color-surface-2); border-radius: var(--radius-full);
  color: var(--color-text-muted);
}
.lesson-table-wrap { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--color-border); margin-bottom: 16px; }
.lesson-table {
  width: 100%; border-collapse: collapse; font-size: .88rem;
}
.lesson-table thead th {
  background: var(--color-surface-2); padding: 10px 16px;
  text-align: left; font-weight: 700; font-size: .78rem;
  text-transform: uppercase; letter-spacing: .5px; color: var(--color-text-muted);
  border-bottom: 2px solid var(--color-border); white-space: nowrap;
}
.lesson-table__row td { padding: 11px 16px; border-bottom: 1px solid var(--color-border); vertical-align: middle; }
.lesson-table__row:last-child td { border-bottom: none; }
.lesson-table__row:hover td { background: var(--color-surface-2); }
.lesson-table__word {
  display: flex; align-items: center; gap: 8px;
  font-weight: 600; color: var(--color-text);
}
.lesson-table__transcr { color: var(--color-text-muted); font-style: italic; font-size: .85rem; }
.lesson-table__trans   { color: var(--color-text); }
.lesson-speech-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; flex-shrink: 0;
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: 50%; color: var(--color-text-muted); cursor: pointer;
  transition: all var(--transition);
}
.lesson-speech-btn:hover {
  background: var(--lesson-color, var(--color-primary));
  border-color: var(--lesson-color, var(--color-primary));
  color: #fff; transform: scale(1.1);
}
.lesson-vocab-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ── Prev / Next Bar ─────────────────────────────────────────────────────── */
.lesson-nav-bar {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.lesson-nav-bar__prev,
.lesson-nav-bar__next { min-width: 0; }
.lesson-nav-btn {
  display: flex; align-items: center; gap: 14px;
  background: var(--color-surface); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); padding: 16px 20px;
  text-decoration: none; color: var(--color-text);
  transition: all .22s ease; border: 1px solid var(--color-border);
}
.lesson-nav-btn:hover {
  box-shadow: var(--shadow-md); transform: translateY(-2px);
  border-color: var(--lesson-color, var(--color-primary));
  color: var(--color-text);
}
.lesson-nav-btn--next { flex-direction: row-reverse; text-align: right; }
.lesson-nav-btn__icon {
  width: 40px; height: 40px; flex-shrink: 0;
  background: var(--color-surface-2); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--lesson-color, var(--color-primary));
  transition: background var(--transition);
}
.lesson-nav-btn:hover .lesson-nav-btn__icon {
  background: var(--lesson-color, var(--color-primary));
  color: #fff;
}
.lesson-nav-btn__text small { display: block; font-size: .75rem; color: var(--color-text-muted); margin-bottom: 3px; }
.lesson-nav-btn__text span  { font-size: .88rem; font-weight: 600; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ── Sidebar ─────────────────────────────────────────────────────────────── */
.lesson-sidebar {
  display: flex; flex-direction: column; gap: 16px;
  position: sticky; top: calc(var(--header-height) + 16px);
}
.lesson-sidebar-widget {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.lesson-sidebar-widget__title {
  font-family: var(--font-head); font-size: .78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .8px;
  color: var(--color-text-muted); padding: 16px 16px 10px; margin: 0;
}

/* Category Card */
.lesson-cat-card {
  border-top: 4px solid var(--lesson-color, var(--color-primary));
}
.lesson-cat-card__header {
  display: flex; align-items: center; gap: 12px; padding: 16px;
}
.lesson-cat-card__icon { font-size: 2rem; line-height: 1; }
.lesson-cat-card__name { font-family: var(--font-head); font-size: .95rem; font-weight: 700; color: var(--color-text); }
.lesson-cat-card__lang { font-size: .8rem; color: var(--color-text-muted); margin-top: 2px; }
.lesson-cat-card__link {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; font-size: .85rem; font-weight: 600;
  color: var(--lesson-color, var(--color-primary));
  border-top: 1px solid var(--color-border);
  text-decoration: none; transition: background var(--transition);
}
.lesson-cat-card__link:hover { background: var(--color-surface-2); color: var(--lesson-color, var(--color-primary)); }

/* Sidebar lesson list */
.lesson-sidebar-list { padding: 0 0 8px; }
.lesson-sidebar-list__item { border-top: 1px solid var(--color-border); }
.lesson-sidebar-list__item:first-child { border-top: none; }
.lesson-sidebar-list__link {
  display: flex; align-items: flex-start; gap: 8px;
  padding: 10px 16px; font-size: .84rem; color: var(--color-text);
  text-decoration: none; transition: background var(--transition); line-height: 1.4;
}
.lesson-sidebar-list__link:hover { background: var(--color-surface-2); color: var(--color-primary); }
.lesson-sidebar-list__link svg { flex-shrink: 0; margin-top: 2px; color: var(--color-text-muted); }

/* Back to language button */
.lesson-back-lang-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 16px; font-size: .88rem; font-weight: 600;
  color: var(--color-primary); text-decoration: none;
  background: var(--color-primary-light); transition: all var(--transition);
  border-radius: var(--radius);
}
.lesson-back-lang-btn:hover { background: var(--color-primary); color: #fff; }
.lesson-back-lang-btn span:first-child { font-size: 1.4rem; }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-sidebar { position: static; }
}
@media (max-width: 640px) {
  .lesson-hero__content { flex-direction: column; text-align: center; gap: 14px; }
  .lesson-hero__back { align-self: center; }
  .lesson-body, .lesson-vocab-section { padding: 20px; }
  .lesson-nav-bar { grid-template-columns: 1fr; }
  .lesson-nav-btn--next { flex-direction: row; text-align: left; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   Lesson Sidebar — Redesigned
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Language Panel ──────────────────────────────────────────────────────── */
.sb-lang-panel {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.04);
  border: 1px solid var(--color-border);
}

/* Gradient head */
.sb-lang-panel__head {
  display: flex; align-items: center; gap: 14px;
  padding: 20px 18px 18px;
  background: linear-gradient(135deg, var(--sb-color, var(--color-primary)) 0%, #0F172A 100%);
  position: relative; overflow: hidden;
  color: #fff;
}
.sb-lang-panel__head * { color: inherit; }
.sb-lang-panel__head::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 90% 10%, rgba(255,255,255,.12) 0%, transparent 50%);
  pointer-events: none;
}

/* Flag with glow ring */
.sb-lang-panel__flag-wrap {
  position: relative; flex-shrink: 0; width: 54px; height: 54px;
}
.sb-lang-panel__flag {
  position: relative; z-index: 1;
  width: 58px; height: 58px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.6rem; line-height: 1;
  background: rgba(255,255,255,.18); border-radius: 50%;
  border: 2px solid rgba(255,255,255,.35);
  backdrop-filter: blur(6px);
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
}
.sb-lang-panel__flag-ring {
  position: absolute; inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.15);
  animation: sb-ring-pulse 3s ease-in-out infinite;
}
@keyframes sb-ring-pulse {
  0%, 100% { transform: scale(1);   opacity: 1; }
  50%       { transform: scale(1.1); opacity: .4; }
}

/* Name & badges */
.sb-lang-panel__info { flex: 1; min-width: 0; }
.sb-lang-panel__name {
  font-family: var(--font-head); font-size: 1.1rem; font-weight: 800;
  color: #fff; margin: 0 0 8px; text-shadow: 0 2px 8px rgba(0,0,0,.4);
}
.sb-lang-panel__badges { display: flex; gap: 6px; flex-wrap: wrap; }
.sb-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px; border-radius: var(--radius-full);
  background: rgba(255,255,255,.2); border: 1px solid rgba(255,255,255,.3);
  font-size: .74rem; font-weight: 700; color: #fff;
  text-shadow: none;
}
.sb-badge svg { opacity: .9; }

/* Section label */
.sb-lang-panel__label {
  padding: 12px 16px 6px;
  font-size: .7rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: 1px; color: var(--color-text-muted);
  border-top: 2px solid var(--color-border);
  background: var(--color-surface-2);
}

/* Subcategories */
.sb-subcats {
  list-style: none; padding: 0 8px; margin: 0 0 4px;
}
.sb-subcat {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 8px; margin-bottom: 3px;
  text-decoration: none; color: var(--color-text);
  font-size: .86rem; font-weight: 500; transition: all .18s ease;
  position: relative; border: 1px solid transparent;
}
.sb-subcat:hover {
  background: var(--color-surface-2);
  border-color: var(--color-border);
  color: var(--color-text);
  transform: translateX(3px);
}
.sb-subcat__icon {
  font-size: 1.05rem; flex-shrink: 0; line-height: 1;
  width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.05); border-radius: 8px;
  border: 1px solid rgba(0,0,0,.06);
  transition: transform .18s ease;
}
.sb-subcat:hover .sb-subcat__icon { transform: scale(1.15); }
.sb-subcat__name { flex: 1; font-size: .83rem; line-height: 1.3; }
.sb-subcat__count {
  font-size: .7rem; font-weight: 700;
  padding: 2px 7px; border-radius: var(--radius-full);
  background: var(--color-surface-2); color: var(--color-text-muted);
  transition: all .18s ease;
}
.sb-subcat__arrow { color: var(--color-text-muted); flex-shrink: 0; }

/* Active subcategory */
.sb-subcat--active {
  background: var(--sb-color, var(--color-primary));
  color: #fff; font-weight: 700;
  box-shadow: 0 4px 14px rgba(0,0,0,.22);
  border-color: transparent;
}
.sb-subcat--active:hover { transform: none; color: #fff; background: var(--sb-color, var(--color-primary)); border-color: transparent; }
.sb-subcat--active .sb-subcat__icon { background: rgba(255,255,255,.22); border-color: rgba(255,255,255,.15); color: #fff; }
.sb-subcat--active .sb-subcat__name { color: #fff; }
.sb-subcat--active .sb-subcat__count { background: rgba(255,255,255,.22); color: #fff; }
.sb-subcat--active .sb-subcat__arrow { color: rgba(255,255,255,.8); }

/* CTA button */
.sb-lang-panel__cta {
  display: flex; align-items: center; gap: 8px; justify-content: center;
  margin: 8px; padding: 11px 14px; border-radius: 8px;
  background: linear-gradient(135deg, var(--sb-color, var(--color-primary)), #0F172A);
  color: #fff; font-size: .83rem; font-weight: 700;
  text-decoration: none; transition: opacity .2s, transform .2s;
}
.sb-lang-panel__cta:hover { opacity: .88; transform: translateY(-1px); color: #fff; }
.sb-lang-panel__cta svg { flex-shrink: 0; }

/* ── Other lessons widget ─────────────────────────────────────────────────── */
.sb-lessons-widget {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.04);
  border: 1px solid var(--color-border);
}
.sb-lessons-widget__head {
  display: flex; align-items: center; gap: 8px;
  padding: 14px 16px;
  font-size: .8rem; font-weight: 800; text-transform: uppercase; letter-spacing: .8px;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
  background: var(--color-surface-2);
}
.sb-lessons-list { list-style: none; padding: 6px 8px; margin: 0; }
.sb-lessons-list__item + .sb-lessons-list__item { border-top: 1px solid var(--color-border); }
.sb-lessons-list__link {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 8px; border-radius: 7px;
  text-decoration: none; color: var(--color-text); font-size: .84rem; font-weight: 500;
  transition: all .18s ease;
}
.sb-lessons-list__link:hover {
  background: var(--color-surface-2); color: var(--color-primary);
  transform: translateX(3px);
}
.sb-lessons-list__num {
  width: 22px; height: 22px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: 6px; font-size: .7rem; font-weight: 700; color: var(--color-text-muted);
}
.sb-lessons-list__title { flex: 1; line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sb-lessons-list__arrow { flex-shrink: 0; color: var(--color-text-muted); opacity: 0; transition: opacity .18s, transform .18s; }
.sb-lessons-list__link:hover .sb-lessons-list__arrow { opacity: 1; transform: translateX(2px); }

/* ── Sidebar more link ───────────────────────────────────────────────────── */
.sb-more-link {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 14px; margin: 4px 8px 8px;
  border-radius: 8px; font-size: .8rem; font-weight: 700;
  color: var(--color-primary); background: var(--color-primary-light);
  text-decoration: none; border: 1px solid transparent;
  transition: all .18s ease;
}
.sb-more-link:hover {
  background: var(--color-primary); color: #fff;
}

/* ── Footer Important Pages ─────────────────────────────────────────────── */
.footer-pages-list {
  list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px;
}
.footer-pages-list a {
  display: flex; align-items: center; gap: 7px;
  font-size: .88rem; color: var(--color-text-muted);
  text-decoration: none; transition: color var(--transition);
}
.footer-pages-list a:hover { color: var(--color-primary); }

/* Footer bottom links bar */
.footer-bottom-links {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.footer-bottom-links a {
  font-size: .78rem; color: var(--color-text-muted); text-decoration: none;
  transition: color var(--transition);
}
.footer-bottom-links a:hover { color: var(--color-primary); }
.footer-bottom-links span { color: var(--color-text-muted); opacity: .4; }